Well, you might think that, Malcolm, but actually I remain quite busy.
I took a look at that formula (and a paper found on line) and could not readily deduce the SI units it supposedly needs. I found no mention of them in the "learned" paper either.
And no, I could not spare much time on it. But someone - a Medical Physics boffin, perhaps - must know.
Meanwhile, I'm not on here much at the moment as, having lost my broadband connection, I'm having to rely on sneaking in via random open Wi-Fi networks (such as the Bingo Hall nearby) on an old (and slow) laptop. It's times like this that tend to highlight the different capabilities of various web browsers. I generally favour Brave, but am having better results with FireFox at the moment. Different version of Windows as well.
